Create CHANGELOG.md

CHANGELOG.md

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+# Changelog
+
+## [0.2.0] - 2026-01-13
+
+### Added
+- Fourier Transform Visualizer: compose signals from up to 4 sine waves with frequency, amplitude, and phase control; displays time-domain signal, magnitude spectrum, phase spectrum, and signal metrics (sampling rate, Nyquist frequency, frequency resolution, total power, RMS amplitude)
+- Linear regression playground: interactive point placement with linear and polynomial regression (degrees 1-10); features residual visualization, confidence bands (±2σ), zoom and pan, drag-and-drop points, and regression statistics (R², adjusted R², MSE, MAE, RMSE, residual plot)
+
+### Changed
+- Refactored shared utilities in `common.js` for matrix operations, statistical calculations, and chart management
+
+## [0.1.0] - 2025-08-15
+
+### Added
+- Direct classification: Gaussian Naive Bayes classifier on synthetic 2D data with adjustable class separation and spread; displays ROC curve, AUC, confusion matrix, and classification metrics
+- Inverse classification: direct confusion matrix manipulation (TP, FP, TN, FN) with metric calculation, ROC curve generation, and score distribution simulation
+- Common utilities: shared JavaScript module with ROC curve computation, confusion matrix rendering, metric calculations, and drag-and-drop functionality
+- Base styling: responsive CSS framework with chart cards, floating controls, and unified visual design
+
+[0.2.0]: https://github.com/berangerthomas/SchoolOfStatistics/compare/v0.1.0...v0.2.0
+[0.1.0]: https://github.com/berangerthomas/SchoolOfStatistics/releases/tag/v0.1.0